Synchrotron Control Data Segmentation for Rapid Ion Beam Energy Changes
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Solution Overview
Problem
The existing particle beam irradiation systems using synchrotrons face challenges in rapidly changing ion beam energy, which limits the dose rate and reproducibility of the irradiation beam, especially when forming a Spread-Out Bragg Peak (SOBP) matching the affected part's thickness, due to non-directly contributing control times and magnetic-field history inconsistencies.
Innovation Solution
The system employs a multistage extraction-control operation with operation-control data constructed from module data items corresponding to plural control intervals, corrected using residual field correction data, allowing for flexible combination of irradiation energies and sequential output of control command values to achieve rapid energy changes and maintain reproducibility of beam range and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multistage extraction-control operation is used to change ion beam energy rapidly, then dose rate is improved, but magnetic-field history inconsistency occurs reducing reproducibility
Solution Approach 1:
The operation-control data is segmented into multiple module data items, each corresponding to a specific control interval (acceleration, energy change, deceleration). This segmentation allows the system to maintain consistent magnetic-field history within each module while enabling flexible combination of modules for different irradiation energies, thus resolving the contradiction between rapid energy change and reproducibility
Solution Approach 2:
The patent pre-calculates and stores operation-control data as standardized module data items with consistent magnetic-field history. By preparing these modules in advance, the system can rapidly retrieve and combine them for different irradiation scenarios without recalculating magnetic-field parameters, ensuring both speed and reproducibility
2Adaptability or versatility
If operation cycle is updated frequently to change ion beam energy, then adaptability to different affected parts is improved, but time for energy change increases
Solution Approach 1:
The system dynamically combines predefined operation-control modules based on the specific irradiation requirements. Instead of updating the entire operation cycle from scratch, the control device selectively assembles relevant modules (acceleration, energy change, deceleration) to match the desired energy transition, significantly reducing the time required while maintaining full adaptability
Solution Approach 2:
The patent changes the parameter representation from complete operation cycles to modular control intervals. Each module contains parameter data for a specific phase (acceleration, energy change, deceleration), allowing the system to adjust energy by selecting and combining appropriate modules rather than reconfiguring entire operation cycles, thus reducing time loss
3Productivity
If control time for acceleration and deceleration is reduced, then dose rate is improved, but control precision of beam energy is reduced
Solution Approach 1:
The system performs preliminary calculation and storage of precise control parameters within each operation-control module. By pre-determining the exact magnetic-field parameters and timing for acceleration and deceleration phases, the system can execute these pre-optimized sequences rapidly without sacrificing precision, as the optimal parameters have already been calculated and stored
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables enhanced dose rate and positional accuracy of the irradiation beam without relying on multistage extraction-control operations, allowing for shorter treatment times and precise energy control during particle beam irradiation.
Implementation Method 1
a synchrotron (13) as an ion beam generator (11)
Implementation Method 2
a magnetic-field history of each of electromagnets making up the synchrotron
Data Source
AI summary
Operation control data of each of the constituent sub-units of a synchrotron is constructed by a combination of module data items (initial acceleration data item, plural energy change data items, and a deceleration control data item), corresponding to plural control intervals, respectively. A control start value, a control completion value, and a computing function for connecting the control start value with the control completion value are expressed in each of module data items. Further, the plural module data items are corrected on the basis of a correction data item of a residual field, and a power-supply control command value is sequentially outputted. By preparing correction table data of the residual field, expressed by irradiation energy and irradiation stage numbers of the irradiation energy beforehand, the correction table data items of the plural module data items are selected from the correction table data to be prepared.